JPH0518556Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a pipe joint that is applied to small-diameter public pipes made of PVC.

[Conventional technology and its problems]

Drainage pipes are generally equipped with gaiters at bends and branches in order to inspect and repair clogged pipes. Among these cells, public sewage cells are specifically determined by the ordinances of each city. For example, the cells must be made of square concrete or reinforced concrete, and their installation location is at the boundary between public roads and private land. Standards such as cutting an invert at the bottom of the square are determined.

In other words, a public sewage tank must be able to withstand long-term use, be easy to inspect and clean, and meet certain conditions such as allowing sewage water from private areas to flow into the main sewage pipe without stagnation. . In particular, maintenance tools such as inspection mirrors, rods, small television cameras, and jet cleaning nozzles must be made available for inspection and cleaning.

Conventionally, public sewage basins based on such standards have been large in size, but the narrowing of roads has made it difficult to install public sewage basins, and the aesthetic appearance has also been damaged.

Therefore, in order to solve these problems, we designed the squares shown in Figure 3 with the aim of downsizing the squares and reducing construction costs, making it easier to place the squares even on narrow roads, and reducing the frequency of square repairs. A sewer pipe piping structure as shown was devised.

That is, in FIG. 3, a public road A and a private land B are bounded by an L-shaped gutter C, and a sewer pipe structure D is buried underground. What is shown in the figure is a horizontal pipe, for example, a case where it is shallowly buried, and a sewer main pipe (not shown) is buried relatively shallowly. A PVC attachment pipe 1 is branched from this sewage main pipe and extended into private land B. At the horizontal part of this mounting pipe 1 with a slight slope, a PVC pipe with a diameter of 100 to 150 mm is installed in the public road A near the bottom of the L-shaped side gutter C.
A straight pipe 2 for the cleaning port is installed upright. The mounting pipe 1 and the cleaning port straight pipe 2 are connected via a Y joint 3' bent at a large angle of 90°. i.e. this 90°
Sleeve (socket) 6 of branch 4 of large bent Y joint 3'
A straight pipe 2 for the cleaning port is connected to. An appropriate cleaning lid 5 is provided at the upper end of this cleaning port straight pipe 2, and this is aligned with the ground surface GL of the public road. Note that 7 indicates a freely bendable pipe.

The mounting pipe 1 and the cleaning port straight pipe 2 are connected with a standardized 90° large bent Y joint 3', and the waste water is allowed to flow down through this joint 3', and from the cleaning port straight pipe 2. The above-mentioned cleaning rods and jet cleaning nozzles are inserted, and cleaning is performed using the Ayumat method.Furthermore, an inspection mirror is inserted to conduct internal inspections.

Therefore, according to this proposal, the various problems mentioned above are solved to a certain extent.

However, when looking down from the opening side of the sleeve 6 of the branch 4, the 90° large-bend Y joint 3' standardized by JIS has a large opening area that is not large enough to accommodate the opening area of the sleeve 6, as shown in Fig. 4 A and B. On the other hand, only 63.5% of the tube bottom in the main part 9 is visible because it is obstructed by the crescent-shaped edge 8. In other words, the area near the base of the branch portion 4 has a usable cross-sectional area of only 63.5% when viewed from the opening side of the sleeve 6. Therefore, there was a problem in the inspection using the inspection mirror 10 shown in FIG.

In addition, instead of the 90° large bend Y joint, the fifth
It is possible to use a 90° Y joint (CT joint) 3'a standardized by JIS as shown in the figure, or
We have attempted to use small-diameter sewage basins for private use, such as those introduced in Publication No. 29490, but in these cases, the cleaning rod or jet cleaning nozzle could not be inserted smoothly in the downstream direction, which was an inconvenience. , does not meet the applicable conditions for public sewage basins,
Finally, a problem arose.

[Means for solving problems]

Therefore, the present invention aims to provide a pipe joint that can be applied to small-diameter public pipes that is convenient for maintenance and inspection, without changing the structure of the standardized 90° large bend Y joint as much as possible. The gist of it is:
As shown in Figure 6, a PVC straight pipe 2 for a cleaning port is connected to a PVC installation pipe 1 that is branched from the main sewage pipe and installed near the boundary between a public road and a private area. The pipe joint 3 is attached to a double-ended sleeve 21,
21, a main part 20 connecting these double-ended sleeves 21, 21, a branch sleeve 22 opening in a direction perpendicular to the double-ended sleeves 21, 21, and a branch sleeve 22 and main part 20. Connecting branches 23
The upstream ridge line 25 of the branch 23 is connected to the double-ended sleeve 21. , 21 and connected to the base of the sleeve 21 on the upstream side, and the downstream ridge line 2 of the branch portion 23
4 is inclined with respect to the axes of the double-ended sleeves 21, 21, and connected in one straight line with the base of the sleeve 21 on the downstream side, and the straight pipe 2 for the cleaning port is connected to the branch sleeve 22. This is a small-diameter PVC pipe fitting for public tubs that is characterized by being installed vertically.

〔Example〕

The structure of the present invention will be explained in detail with reference to the embodiment shown in FIGS. 1 and 2.

The pipe joint 3 of this example has a 90° large bend Y according to the JIS standard.
Almost the same structure as the main part of the joint (however, double-ended sleeve 2
1 and 21 is slightly longer due to the upstream ridge line of the branch portion 23 described later being made vertical.
The double-ended sleeves 21 and 21 of the 90° large bend Y joint have approximately the same size and arrangement position.
Branch sleeve 2 which has the same size and arrangement as the branch sleeve of a 90° large bend Y joint.
2, and a branch portion 23 connecting these main portions 20 and the branch sleeve 22.
The downstream ridge line (in this specification, the most protruding part of the branch 21 on the downstream side) 24 is a straight line inclined toward the base of the sleeve 21 on the downstream side, and the upstream ridge line (In this specification, branch 2
(This refers to the most protruding part on the upstream side of 3)
25 is connected vertically to the base of the sleeve 21 on the upstream side, thereby enlarging the connecting portion between these sleeves 21, 21, 22, that is, the space near the base of the branch portion 23. In particular, the upstream ridge line 25 of the branch portion 23 connecting the branch sleeve 22 and the base of the sleeve 21 on the upstream side of the main portion 20 is vertical;
Compared to the conventional 90° large-bend Y joint 3', the space in the upstream ridge line region is expanded.

In addition, in the pipe joint 3 of this embodiment, the main portion 20 and the branch portions 23 may be molded separately by injection molding, and then integrated by adhesive bonding, but when integrally molded, the following steps are required. Bye. In other words, conventionally, when forming an LT joint, the curved branch part is
Although one rotating core is rotated and molded to the branch sleeve side, in the case of this example, the branch core is divided into two parts, the core on the downstream ridge line side and the core on the upstream ridge line side. The core on the downstream ridge line side is
It is rotated toward the downstream sleeve with the same rotation radius as the LT joint, and the core on the upstream ridge line side is integrated with the branch sleeve and formed so as to be pulled out upward in the figure.

[Effect of idea]

According to the present invention, a double-ended sleeve, a main part connecting these double-ended sleeves, a branch sleeve opening in a direction perpendicular to the double-ended sleeve, and these branch sleeves and the main part are provided. A pipe joint consisting of a connecting branch, that is, a 90° large bend Y standardized by JIS.
A pipe joint in which the double-end sleeve and the branch sleeve are approximately the same in size and location was used as a public sewage basin, so it was similar to a standardized 90° large-bend Y joint. Not only can filthy water from private areas flow smoothly into the main sewer pipe without clogging, but the upstream ridge line is vertical toward the base of the sleeve on the upstream side, so it can be used as a straight pipe for cleaning. You can see the entire bottom of the pipe joint from here.

The downstream ridge line is made into a straight line that slopes toward the base of the sleeve on the downstream side, so it serves as a guide for inserting cleaning rods, etc., and the cleaning rods and jet cleaning nozzles are placed on the downstream side, that is, the main sewage pipe. It can be inserted smoothly. Therefore, it is suitable as a public sewage tank.

The upstream ridge line is vertical toward the base of the sleeve on the upstream side, and the downstream ridge line is a straight line inclined toward the base of the sleeve on the downstream side, so it is possible to create a 90° large Y joint, The above-mentioned Jitsukai 1987-
Compared to the sewage basin in Publication No. 29490, the space near the base of the branch can be made larger, and the inspection mirror must be used as a public sewage basin.
It becomes easy to use rod rods, small TV cameras, jet cleaning nozzles, etc., and in combination with the above-mentioned full-surface overlooking effect, it becomes suitable for cleaning and inspection as a public sewage basin.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a sectional view from a to a of Fig. 1, Fig. 3 is a sectional view of a conventional sewage pipe structure, and Fig. 4 A is a general 90° Figure 5 is a cross-sectional view of a general DT joint, and Figure 6 is a reference diagram. DESCRIPTION OF SYMBOLS 1... Mounting pipe, 2... Straight pipe for cleaning port, 3... Pipe joint, 20... Main part, 21... Sleeve, 22...
... Branch sleeve, 24 ... Downstream ridge line, 25 ...
...Upstream ridge line, A...Public road, B...Private land.

Claims (1)

[Scope of Claim for Utility Model Registration] A PVC straight pipe 2 for a cleaning port is attached to a PVC installation pipe 1 that is branched from a sewer main pipe and installed near the boundary between a public road and a private land, and a PVC pipe joint is installed. 3, the pipe joint 3 is connected to the double-ended sleeves 21, 21, the main part 20 connecting these double-ended sleeves 21, 21, and the double-ended sleeves 21, 21. a branch sleeve 22 that opens in a direction perpendicular to the branch sleeve 22 and the main portion 20;
A standardized branch 23 that connects the
It is constructed of a pipe joint in which the size and arrangement position of each sleeve in the 90° large bend Y joint are approximately the same, and the upstream ridge line 25 of the branch portion 23 is made perpendicular to the axis of the double-ended sleeves 21, 21. , and connected to the base of the sleeve 21 on the upstream side, the downstream ridge line 24 of the branch portion 23 is inclined with respect to the axis of the double-ended sleeves 21, 21, and the base of the sleeve 21 on the downstream side and the cleaning port straight pipe 2 is connected to the branch sleeve 22 in one straight line.
PVC pipe joint for small diameter public baths, characterized by the fact that it is installed vertically.